Topic
Data Structures & Algorithms
Real interview questions with expert answers, plain-English explanations, and practical examples. (17 questions)
Meta
Data Engineer
Data Structures & Algorithms
A Meta data pipeline processes real-time clickstream data, needing to identify unique visitors within a 15-minute rolling window. How would you design a data structure and algorithm to efficiently track unique visitor IDs, supporting both additions and automatic expiration?
Microsoft
Data Engineer
Data Structures & Algorithms
A Microsoft data engineer needs to count unique users from a high-volume, real-time event stream. How would you choose and implement appropriate data structures for efficient, approximate cardinality estimation?
LinkedIn
Backend Developer
Data Structures & Algorithms
When designing a social network feed, how would a backend developer at LinkedIn choose and implement data structures for efficient storage and retrieval of connections and posts?
Airbnb
Data Engineer
Data Structures & Algorithms
How would an Airbnb Data Engineer select optimal data structures to process and query large-scale, real-time event data efficiently?
Microsoft
Mobile Developer
Data Structures & Algorithms
Your Microsoft mobile application frequently displays complex, hierarchical data. How would a mobile developer choose and implement optimal data structures to ensure efficient navigation and updates?
Mphasis
Mobile Developer
Data Structures & Algorithms
Your Mphasis mobile application displays a large, frequently updated list of user-generated content. How would you choose and implement data structures to ensure smooth scrolling and fast filtering/searching for this list?
Tech Mahindra
Data Engineer
Data Structures & Algorithms
How would you choose the optimal data structure for real-time analytics on a high-velocity data stream?
Uber
Data Engineer
Data Structures & Algorithms
When would you use a Merkle Tree in a data pipeline, and what benefits does it provide for data integrity?
Deloitte
Data Engineer
Data Structures & Algorithms
Explain the HyperLogLog algorithm, and how would a data engineer use it to estimate unique counts for massive datasets?
ServiceNow
Mobile Developer
Data Structures & Algorithms